Qt: Add live ubershader editor #533
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This PR adds the ability to edit the fragment shader used for the ubershader in real time, in order to be able to easily and efficiently debug it, edit it and/or profile it. Any syntax errors are written to the console and the editor is designed to be backend-agnostic, though only the OpenGL renderer has had the relevant glue code written for it atm.
Example of live editing the ubershader to make the red component stronger:
